---
gsd_state_version: 1.0
milestone: v1.x
milestone_name: routing-engine-upgrades-and-extras
status: ready_to_plan
stopped_at: "F1 remediation applied (debug alt-potential-4x-slowdown RC-1): clean-columns-only ALT containment in routing/src/astar.ts — per-node sentinel skip removed; suite re-spec'd RED-first (A11) + new A13 mixed-column case; new committed oracle sweep measure-astar-oracle-sweep.mjs 0/200 suboptimal; CPU back in the pre-ALT band (p95 136.6 ms this host vs 1037.6 pre-fix — honest c3 FAIL vs 8 ms stands); D-03 gate green. Commits c071e20 / 2a5a0b5 / 97d6e35. NEXT: maintainer R2 upload + the SC-1 escalation decision (unchanged)"
last_updated: "2026-10-25T14:15:06.953Z"
last_activity: 2026-10-26
progress:
  total_phases: 4
  completed_phases: 2
  total_plans: 5
  completed_plans: 5
  percent: 50
---

# Project State

## Project Reference

See: .planning/PROJECT.md (updated 2026-10-22)

**Core value:** A user finds a local destination via Telegram and gets there with reliable turn-by-turn guidance — tracked by nothing beyond what they explicitly opted in to.
**Current focus:** Phase 08 — ALT landmark preprocessing (routing backend v2)

## Current Position

Phase: 08.1
Plan: Not started
Status: Ready to plan
Last activity: 2026-10-26 - Completed quick task 261026-d95: isolated ALT direction-split research (NO-GO; no production integration)

Progress: [██████████] 100%

## Performance Metrics

**Velocity:**

- Total plans completed: 39
- Average duration: —
- Total execution time: —

**By Phase:**

| Phase | Plans | Total | Avg/Plan |
|-------|-------|-------|----------|
| — | — | — | — |
| 01 | 4 | - | - |
| 02 | 3 | - | - |
| 3 | 4 | - | - |
| 4 | 4 | - | - |
| 5 | 5 | - | - |
| 6 | 8 | - | - |
| 7 | 6 | - | - |
| 8 | 5 | - | - |

## Accumulated Context

### Decisions

Logged in PROJECT.md Key Decisions table. Affecting current work:

- Routing = Valhalla (toll-free stays v2); self-hosted Photon for lookup; OpenFreeMap tiles + MapLibre GL JS v6
- grammY on one Cloudflare Worker (static assets + webhook + /api/*) — Workers, not Pages
- KV-only storage, TTL-only (chat_sessions minutes / guidance_sessions ~2h); guidance_sessions envelope designed in Phase 5 (upstream pre-work for GUID-05/06)

### Pending Todos

None yet.

### Blockers/Concerns

- **PHASE 8 ESCALATION (open, 2026-10-25):** the CPU verdict measured FAIL post-ALT (25-route p95 152.788 ms / extended 185.692 ms vs the 8 ms budget; the L=32 probe worse) — the c3 class remains. The theoretical wall: no two-sided-Lipschitz landmark extension exists on a graph with sentinel fringes; sound+fast needs direction-split potentials with a re-proven meet rule (search-skeleton work). Options: direction-split potentials (new phase) / CH (Phase-6 deferral) / Workers Paid reversal ($0 law) / keep c3 (current shipped posture). Records: docs/BUDGETS.md §c3, docs/KNOWN-LIMITATIONS.md, 08-05-SUMMARY.md. **F1 addendum (2026-10-25, post-plan):** the debug session also exposed RC-1 — a LIVE correctness bug in the ALT potential (per-node sentinel skip broke cross-edge consistency; 1/194 fresh pairs suboptimal vs Dijkstra) — fixed the same day (clean-columns-only containment; commits c071e20/2a5a0b5/97d6e35; new committed oracle-sweep gate 0/200). On the current 0/24-clean binary ALT is inert (exact haversine), so the CPU band is pre-ALT again (p95 136.6 ms this host) and this escalation is UNCHANGED — a future clean-column binary re-arms ALT with no code change; F2 (transposed tables) is the then-relevant performance follow-up.
- ~~PHASE 4 device-gate legs UNVERIFIED~~ RESOLVED 2026-10-24: legs 1–4+6 PASS on real hardware; leg 5 user-accepted (BotFather Main Mini App configured; unknown-id surface covered by automated gates). Known-open cosmetic: /cari absent from the client command menu (Telegram non-default setMyCommands defect; command works when typed; register script re-arms all scopes for retry).
- Design-source conflict (root `DESIGN.md` typography vs `telemetry_rams/DESIGN.md` + mockups) — Phase 1 resolves; mockup markup is layout reference only, design doc tokens are binding (scrub rounded/blur utilities)
- ~~VPS provisioning starts in Phase 4 (Photon bake-off)~~ SUPERSEDED by Phase 4 D-03: search is an in-Worker curated gazetteer ($0); VPS provisioning (Valhalla + Photon) defers to Phase 5; Photon is a documented SearchSource backend #3 (free-first mandate: one VPS, Oracle Cloud Always Free candidate)
- Research-flagged phases needing `/gsd-research-phase`: 3 (geolocation client matrix), 4 (Photon KL bake-off + gazetteer), 6 (backgrounded turn-card framing + snapshots)
- Project skill `.agents/skills/design-taste-frontend/` applies to UI phases (existing-design-system special case; Rams tokens binding)

### Quick Tasks Completed

| # | Description | Date | Commit | Directory |
|---|-------------|------|--------|-----------|
| 261024-001 | Replace logo references with master assets | 2026-10-24 | TBD | [261024-001-logo-asset-replacement](./quick/261024-001-logo-asset-replacement/) |
| 261026-d95 | Isolated ALT direction-split research: proved and measured, NO-GO for integration | 2026-10-26 | 9a671bd | [261026-d95-alt-direction-split-isolated-research-si](./quick/261026-d95-alt-direction-split-isolated-research-si/) |

## Deferred Items

| Category | Item | Status | Deferred At |
|----------|------|--------|-------------|
| v1.x features | Voice guidance, live trip share, toll toggle, speed limits | Deferred to v1.x milestone (after user validation) | Roadmap init 2026-10-22 |
| v2 | Incident reports, gamification, traffic-weighted ETA | Out of scope for v1 | Requirements defined 2026-10-22 |

## Session Continuity

Last session: 2026-10-25T14:15:06.939Z
Stopped at: "F1 remediation applied (debug alt-potential-4x-slowdown RC-1): clean-columns-only ALT containment; oracle sweep 0/200; CPU in the pre-ALT band (c3 stands); D-03 green — gates re-run 2026-10-25"
Resume file: None